I just recently got a pretty awesome iMac G4 15" (1.0GHz USB 2.0) for free off of craigslist. It also came with Mac OS X Tiger, 768mb ram, and an 80gb hard drive. The questions I have are should I upgrade the ram and the operating system? I plan on buying a 1GB module so it can have 1.25GB ram, also I want to put leopard on it so it's not totally outdated. Will I see a little more speed upgrading from 768mb to 1.25gb ram?